更新 Visual Studio 2019 错误

Question

我有 Visual Studio 2019 社区的更新。 我现在使用的是 16.10.2 版。 但是现在我不能再打开我的解决方案了。 现有项目未加载，日志显示如下：

===================== 18-6-2021 08:58:43 可恢复的 System.MissingMethodException：找不到方法：'System.Collections.Generic.LinkedListNode 1<.0> System.Collections.Generic.LinkedList 1.gdt_Last()'。 在 Microsoft.Build.Evaluation.ProjectRootElementCache.BoostEntryInStrongCache（ProjectRootElement projectRootElement） 在 Microsoft.Build.Evaluation.ProjectRootElementCache.RenameEntryInternal（String oldFullPathIfAny，ProjectRootElement projectRootElement） Construction.ProjectRootElement..ctor（字符串路径，ProjectRootElementCacheBase projectRootElementCache，Boolean preserveFormatting）在 Microsoft.Build.Construction.ProjectRootElement.OpenLoader（字符串路径，ProjectRootElementCacheBase projectRootElementCache）在 Microsoft.Build.Evaluation.ProjectRootElementCache.Get（字符串 projectFile，OpenProjectRootElement openProjectRootElement， Boolean isExplicitlyLoaded, Nullable 1 preserveFormatting) at Microsoft.Build.Construction.ProjectRootElement.Open(String path, ProjectRootElementCacheBase projectRootElementCache, Boolean isExplicitlyLoaded, Nullable 1 preserveFormatting) 在 Microsoft.Build.Construction.ProjectRootElement.Open(String path, ProjectCollection projectCollection, Nullable 1 preserveFormatting) at Microsoft.VisualStudio.ProjectSystem.ProjectLockService.Microsoft.VisualStudio.ProjectSystem.IProjectLockReleaser.GetProjectXmlAsync(String projectFile, CancellationToken cancellationToken) at Microsoft.VisualStudio.ProjectSystem.UnconfiguredProjectImpl.<>c__DisplayClass185_0.<<SaveUserFileAsync>b__0>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.VisualStudio.Threading.JoinableTask.<JoinAsync>d__76.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.VisualStudio.ProjectSystem.ProjectLockService.<ExecuteWithinLockAsync>d__128.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.VisualStudio.ProjectSystem.ProjectLockService.<ExecuteWithinLockAsync>d__128.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.VisualStudio.ProjectSystem.UnconfiguredProjectImpl.<DisposeAsync>d__174.MoveNext() =================== 18-6-2021 08:58:43 Recoverable System.MissingMethodException: Method not found: 'System.Collections.Generic.LinkedListNode 1 preserveFormatting) at Microsoft.VisualStudio.ProjectSystem.ProjectLockService.Microsoft.VisualStudio.ProjectSystem.IProjectLockReleaser.GetProjectXmlAsync(String projectFile, CancellationToken cancellationToken) at Microsoft.VisualStudio.ProjectSystem.UnconfiguredProjectImpl.<>c__DisplayClass185_0.<<SaveUserFileAsync>b__0>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.VisualStudio.Threading.JoinableTask.<JoinAsync>d__76.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.VisualStudio.ProjectSystem.ProjectLockService.<ExecuteWithinLockAsync>d__128.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.VisualStudio.ProjectSystem.ProjectLockService.<ExecuteWithinLockAsync>d__128.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.VisualStudio.ProjectSystem.UnconfiguredProjectImpl.<DisposeAsync>d__174.MoveNext() =================== 18-6-2021 08:58:43 Recoverable System.MissingMethodException: Method not found: 'System.Collections.Generic.LinkedListNode 1<.0> System.Collections.Generic.LinkedList 1.gdt_Last()'. at Microsoft.Build.Evaluation.ProjectRootElementCache.BoostEntryInStrongCache(ProjectRootElement projectRootElement) at Microsoft.Build.Evaluation.ProjectRootElementCache.RenameEntryInternal(String oldFullPathIfAny, ProjectRootElement projectRootElement) at Microsoft.Build.Evaluation.ProjectRootElementCache.AddEntry(ProjectRootElement projectRootElement) at Microsoft.Build.Construction.ProjectRootElement..ctor(String path, ProjectRootElementCacheBase projectRootElementCache, Boolean preserveFormatting) at Microsoft.Build.Construction.ProjectRootElement.OpenLoader(String path, ProjectRootElementCacheBase projectRootElementCache) at Microsoft.Build.Evaluation.ProjectRootElementCache.Get(String projectFile, OpenProjectRootElement openProjectRootElement, Boolean isExplicitlyLoaded, Nullable 1.gdt_Last()'. at Microsoft.Build.Evaluation.ProjectRootElementCache.BoostEntryInStrongCache(ProjectRootElement projectRootElement) at Microsoft.Build.Evaluation.ProjectRootElementCache.RenameEntryInternal(String oldFullPathIfAny, ProjectRootElement projectRootElement) at Microsoft.Build.Evaluation.ProjectRootElementCache.AddEntry(ProjectRootElement projectRootElement) at Microsoft.Build.Construction.ProjectRootElement..ctor(String path, ProjectRootElementCacheBase projectRootElementCache, Boolean preserveFormatting) at Microsoft.Build.Construction.ProjectRootElement.OpenLoader(String path, ProjectRootElementCacheBase projectRootElementCache) at Microsoft.Build.Evaluation.ProjectRootElementCache.Get(String projectFile, OpenProjectRootElement openProjectRootElement, Boolean isExplicitlyLoaded, Nullable 1 preserveFormatting) at Microsoft.Build.Construction.ProjectRootElement.Open(String path, ProjectRootElementCacheBase projectRootElementCache, Boolean isExplicitlyLoaded, Nullable 1 preserveFormatting) at Microsoft.Build.Construction.ProjectRootElement.Open(String path, ProjectCollection projectCollection, Nullable 1 preserveFormatting) 在 Microsoft.VisualStudio.ProjectSystem.ProjectLockService.Microsoft.VisualStudio.ProjectSystem.IProjectLockReleaser.GetProjectXmlAsync(String projectFile, CancellationToken cancellationToken) Microsoft.VisualStudio.ProjectSystem.UnconfiguredProjectImpl.<>c__DisplayClass185_0.<b__0>d.MoveNext() --- 从先前抛出异常的位置开始的堆栈跟踪结束 --- 在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.VisualStudio.Threading.JoinableTask.d__76.MoveNext() --- 从先前抛出异常的位置开始的堆栈跟踪结束 --- at System.Runtime .CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebu ggerNotification（任务任务）在 Microsoft.VisualStudio.ProjectSystem.ProjectLockService.d__128.MoveNext() --- 从上一个抛出异常的位置开始的堆栈跟踪结束 --- 在 Microsoft.VisualStudio.ProjectSystem.ProjectLockService.d__128.MoveNext() --- 从先前抛出异常的位置开始的堆栈跟踪结束 --- 在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务） 在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）在 Microsoft.VisualStudio。 ProjectSystem.UnconfiguredProjectImpl.d__174.MoveNext() ===================

如果我使用 MVC Api 启动新解决方案，则会创建解决方案，但不会添加项目。 手动将其添加到解决方案中会出现此错误：

未找到方法：'System.Collections.Generic.LinkedListNode1<.0> System.Collections.Generic.LinkedList1.gdt_Last()'

我尝试了什么：

• 修复 Visual Studio
• 已卸载 Visual Studio 以及与 .NET 或 Microsoft 框架有关的所有内容
• 谷歌搜索（没有找到）

有谁知道为什么会突然发生这种情况？

Answer 1

我怀疑最新版本的 VS2019 更新了解决方案缓存，没有向后兼容性或损坏了它。 尝试删除解决方案文件夹中的隐藏文件夹.vs ，然后使用您要使用的 VS2019 重新打开您的解决方案。

Answer 2

检查这个解决方案

打开.csproj 并删除此标签

<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild"> bla-bla </Target>

Answer 3

这是我的 2¢：

1. 如果您的项目有 NuGet 个包，请检查并正确更新每个包。
2. 我不确定您是否拥有最近 5 版的最新版本的 .Net。当您获取System.Collections.dll并将其替换为具有相同名称的相关.dll 文件时发生了什么。 例如dll在我的电脑中是C:\Program Files\do.net\packs\Microsoft.NETCore.App.Ref\5.0.0\ref.net5.0 。

但是，我认为当您将框架更新为 .Net 5 以及更新相关的 NuGet 包时，问题就解决了。

如何更改项目版本？

右键单击项目， Properties --> Application --> Target framework 。 目标框架下拉列表显示安装在您机器上的框架列表。 如果你不想更新它，至少拿.Net 5 并在下拉菜单中将版本调低。